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S56.501A vs S56.501S

S56.501A (Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, initial encounter) compared with S56.501S (Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, sequela), from the official CMS tabular data. S56.501A and S56.501S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S56.501A
Initial encounter
Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, initial encounter
S56.501S
Sequela
Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, sequela

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. S56.501A and S56.501S code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

S56.501AUnspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, initial encounterS56.501SUnspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, sequela
Billing statusBillableBillable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionUnspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, initial encounter is a billable ICD-10-CM diagnosis code (S56.501A).Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right arm, sequela is a billable ICD-10-CM diagnosis code (S56.501S).
7th characterThe appropriate 7th character is to be added to each code from category S56The appropriate 7th character is to be added to each code from category S56

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources